241 P-feature: A feature (. a topic-, focus- or wh-feature) which attracts a constituent to move to the periphery of a clause. Phase: In work outlined in chapter 10, Chomsky argues that syntactic structures are build up in phases (phases including complementiser phrases and transitive verb phrases), and that once a phase has been produced, the domain/complement of the head of the phase undergoes transfer to the PF component and the semantic component, and thereby becomes impenetrable to further operations in the syntax. .